Mechanical Engineering Interview Questions

stress is the after effect of pressure.

generally, pressure and stress can be distinguished by the point of application where it is applied,
if we are applying in fluid parameter then it is pressure and in solid state parameter then it will be stress.

Condenser improves P.Plant performance by reducing the pressure(due to change in phase i.e gas to liquid) at outlet of turbine.

Condenser changes vapour to liquid phase at constant pressure because pumping of vapour is not possible by pump.

AC can be used as heat pump and refrigerator where as the refrigerator cannot be used as heat pump.

refrigerator is not designed for human comfort whereas ac is designed for human comfort for above 18 Celsius refrigerator for 0 or less than 0 degree Celsius

Heating ventilation and air conditioning

if the suction,compression, power and exhaust are completed in two strokes of the piston, i.e one revolution of crank shaft, it is called as two stroke and if the four processes completed in four strokes of the piston, i.e two rev of crank shaft,it is called as four stroke engine.

In two stroke SI & CI engine , there are two stroke of piston and one revolution of crankshaft to complete one cycle.....IN two stroke engine there are ports... But IN four stroke SI &CI engine , the...

IC engine means what?

two things may happen:

1)knocking will occur since diesel oil has low octane number 30-40.

2)ignition will not takes place since diesel has to reach certain temp for ignition which generally happens in CI engine.

0.01mm clearance

0.01 to 0.03

there are basic three types of gear box-

1> slidingmesh
2> constsntmesh
3> synchromesh

Constant mesh gear box 
sliding mesh gear box
synchro mesh gear box 

C.C. means cubic capacity.capacity increases means space for charge(air-fuel mixture) increases ultimately more burning of fuel means MORE POWER.

c.c means cylinder capacity or cubic centimeter capacity of the cylinder by increasing the c.c the volume of the cylinder becomes more and it can able to burn more fuel at a time . while burning more ...

truss is a stable structure, it exerts only force and no movement .Hence it has zero dof.

ZERO
Because it transmit only force, not motion.
So it has no moving element

In Lathe w.piece rotates and the tool is stationary
In Milling machines it is vice versa of lathe.

In lathe machine cutting tool is stationary and work-piece is rotated , in case of milling machine work-piece remains stationary and cutting tool is rotated.

There are 5 types:_
1-vapor compression
2-vapor absorption
3-Thermo electric refrigeration
4-Thermo acoustic refrigeration
5-cryogenic refrigeration

there are 8 types of refrigation
1-ice refrigation
2-dry ice refrigation
3-evprotive type refrigation
4-air expanshion
5-cooling by theroutling
6-vapur absobsn system
7-vapur compeision system
8-thermo electric refrigation

If the volumetric efficiency increases the power had rise due to that pulling had raises

Sir,
For increasing the power requirement we need to increase cubic capacity of liquid.

Regards
Pradeep Khanduja

According theory of failures von misses stress theory will give you a safe and economic design (Sys/Syt =0.57)

von miss.. result is average of results in all co-ordinates...

Why are we written SS-316 what is meaning of 3,1,and 6 please send me in detail answer

The 316 family is a group of austenitic stainless steels with superior corrosion resistance , Grade specifications for 316 grade stainless steels.

The unwanted sound coming from the engine due to the rapid pressure rise is called Knocking

Higher intake temperature of inlet gasses (without effective compression through a turbo charger or supercharger ) will result in decrease in volumetric efficiency of the engine as less air will enter inside the cylinder due to lower density of air fuel mixture.

Lathe machine can effectively do so. By turning and cutting operation through employing the workpiece in the jig of the machine

Forging & Casting (after melting) etc.

*Weight Volume*Density =length*breadth*height(thickness)*Dens… WHERE, length is in meter, breadth is in meter, thickness is in meter, density is in kg/m^3 now, its depends upon the steel to calcula...

Weight calculation for Plate,Flat,Sheet in MS materials is = (Width X Thick x7.85)/1000 kg/Mtr.

Now from the ans. we can calculated the weight of different length picess.

For Ms Tube

2 x pie x r= ----mm
( eg. OD.30 /Th.10 / ID 10 mm
2x3.14x10 =62.8mm
Now( 62.8x10x7.85)/1000=4.92kg/mtr.